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For the point P (7, 0) defined in the curve E13(1, 1). What is –P?

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For the point P (7, 0) defined in the curve E13(1, 1). What is –P?

(a) (7,1)

(b) (8,12)

(c) (8,1)

(d) (7,0)

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Query is from Elliptic Curve Arithmetic/Cryptography in division Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

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Correct option is (d) (7,0)

The explanation: The inverse of P(11,2) is (11,11) or (11,-2).

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